# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
VMware vCloud driver.
"""
import os
import re
import copy
import time
import base64
import datetime
from xml.parsers.expat import ExpatError

from libcloud.utils.py3 import ET, b, next, httplib, urlparse, urlencode
from libcloud.common.base import XmlResponse, ConnectionUserAndKey
from libcloud.common.types import LibcloudError, InvalidCredsError
from libcloud.compute.base import Node, NodeSize, NodeImage, NodeDriver, NodeLocation
from libcloud.compute.types import NodeState
from libcloud.utils.iso8601 import parse_date
from libcloud.compute.providers import Provider

urlparse = urlparse.urlparse


"""
From vcloud api "The VirtualQuantity element defines the number of MB
of memory. This should be either 512 or a multiple of 1024 (1 GB)."
"""
VIRTUAL_MEMORY_VALS = [512] + [1024 * i for i in range(1, 9)]

# Default timeout (in seconds) for long running tasks
DEFAULT_TASK_COMPLETION_TIMEOUT = 600

DEFAULT_API_VERSION = "0.8"

"""
Valid vCloud API v1.5 input values.
"""
VIRTUAL_CPU_VALS_1_5 = [i for i in range(1, 9)]
FENCE_MODE_VALS_1_5 = ["bridged", "isolated", "natRouted"]
IP_MODE_VALS_1_5 = ["POOL", "DHCP", "MANUAL", "NONE"]

# Regular expression for validating node / VM name
HOSTNAME_RE = re.compile(r"^(?!-)[A-Z\d-]{1,63}(?<!-)$", re.IGNORECASE)


def fixxpath(root, xpath):
    """ElementTree wants namespaces in its xpaths, so here we add them."""
    namespace, root_tag = root.tag[1:].split("}", 1)
    fixed_xpath = "/".join(["{{{}}}{}".format(namespace, e) for e in xpath.split("/")])

    return fixed_xpath


def get_url_path(url):
    return urlparse(url.strip()).path


class Vdc:
    """
    Virtual datacenter (vDC) representation
    """

    def __init__(
        self,
        id,
        name,
        driver,
        allocation_model=None,
        cpu=None,
        memory=None,
        storage=None,
    ):
        self.id = id
        self.name = name
        self.driver = driver
        self.allocation_model = allocation_model
        self.cpu = cpu
        self.memory = memory
        self.storage = storage

    def __repr__(self):
        return "<Vdc: id={}, name={}, driver={}  ...>".format(
            self.id,
            self.name,
            self.driver.name,
        )


class Capacity:
    """
    Represents CPU, Memory or Storage capacity of vDC.
    """

    def __init__(self, limit, used, units):
        self.limit = limit
        self.used = used
        self.units = units

    def __repr__(self):
        return "<Capacity: limit={}, used={}, units={}>".format(
            self.limit,
            self.used,
            self.units,
        )


class ControlAccess:
    """
    Represents control access settings of a node
    """

    class AccessLevel:
        READ_ONLY = "ReadOnly"
        CHANGE = "Change"
        FULL_CONTROL = "FullControl"

    def __init__(self, node, everyone_access_level, subjects=None):
        self.node = node
        self.everyone_access_level = everyone_access_level

        if not subjects:
            subjects = []
        self.subjects = subjects

    def __repr__(self):
        return "<ControlAccess: node=%s, everyone_access_level=%s, " "subjects=%s>" % (
            self.node,
            self.everyone_access_level,
            self.subjects,
        )


class Subject:
    """
    User or group subject
    """

    def __init__(self, type, name, access_level, id=None):
        self.type = type
        self.name = name
        self.access_level = access_level
        self.id = id

    def __repr__(self):
        return "<Subject: type={}, name={}, access_level={}>".format(
            self.type,
            self.name,
            self.access_level,
        )


class Lease:
    """
    Lease information for vApps.

    More info at: 'https://www.vmware.com/support/vcd/doc/
                   rest-api-doc-1.5-html/types/LeaseSettingsSectionType.html'
    """

    def __init__(
        self,
        lease_id,
        deployment_lease=None,
        storage_lease=None,
        deployment_lease_expiration=None,
        storage_lease_expiration=None,
    ):
        """
        :param lease_id: ID (link) to the lease settings section of a vApp.
        :type lease_id: ``str``

        :param deployment_lease: Deployment lease time in seconds
        :type deployment_lease: ``int`` or ``None``

        :param storage_lease: Storage lease time in seconds
        :type storage_lease: ``int`` or ``None``

        :param deployment_lease_expiration: Deployment lease expiration time
        :type deployment_lease_expiration: ``datetime.datetime`` or ``None``

        :param storage_lease_expiration: Storage lease expiration time
        :type storage_lease_expiration: ``datetime.datetime`` or ``None``
        """
        self.lease_id = lease_id
        self.deployment_lease = deployment_lease
        self.storage_lease = storage_lease
        self.deployment_lease_expiration = deployment_lease_expiration
        self.storage_lease_expiration = storage_lease_expiration

    @classmethod
    def to_lease(cls, lease_element):
        """
        Convert lease settings element to lease instance.

        :param lease_element: "LeaseSettingsSection" XML element
        :type lease_element: ``ET.Element``

        :return: Lease instance
        :rtype: :class:`Lease`
        """
        lease_id = lease_element.get("href")
        deployment_lease = lease_element.find(fixxpath(lease_element, "DeploymentLeaseInSeconds"))
        storage_lease = lease_element.find(fixxpath(lease_element, "StorageLeaseInSeconds"))
        deployment_lease_expiration = lease_element.find(
            fixxpath(lease_element, "DeploymentLeaseExpiration")
        )
        storage_lease_expiration = lease_element.find(
            fixxpath(lease_element, "StorageLeaseExpiration")
        )

        def apply_if_elem_not_none(elem, function):
            return function(elem.text) if elem is not None else None

        return cls(
            lease_id=lease_id,
            deployment_lease=apply_if_elem_not_none(deployment_lease, int),
            storage_lease=apply_if_elem_not_none(storage_lease, int),
            deployment_lease_expiration=apply_if_elem_not_none(
                deployment_lease_expiration, parse_date
            ),
            storage_lease_expiration=apply_if_elem_not_none(storage_lease_expiration, parse_date),
        )

    def get_deployment_time(self):
        """
        Gets the date and time a vApp was deployed. Time is inferred from the
        deployment lease and expiration or the storage lease and expiration.

        :return: Date and time the vApp was deployed or None if unable to
                 calculate
        :rtype: ``datetime.datetime`` or ``None``
        """

        if self.deployment_lease is not None and self.deployment_lease_expiration is not None:
            return self.deployment_lease_expiration - datetime.timedelta(
                seconds=self.deployment_lease
            )

        if self.storage_lease is not None and self.storage_lease_expiration is not None:
            return self.storage_lease_expiration - datetime.timedelta(seconds=self.storage_lease)

        raise Exception(
            "Cannot get time deployed. " "Missing complete lease and expiration information."
        )

    def __repr__(self):
        return (
            "<Lease: id={lease_id}, deployment_lease={deployment_lease}, "
            "storage_lease={storage_lease}, "
            "deployment_lease_expiration={deployment_lease_expiration}, "
            "storage_lease_expiration={storage_lease_expiration}>".format(
                lease_id=self.lease_id,
                deployment_lease=self.deployment_lease,
                storage_lease=self.storage_lease,
                deployment_lease_expiration=self.deployment_lease_expiration,
                storage_lease_expiration=self.storage_lease_expiration,
            )
        )

    def __eq__(self, other):
        if not isinstance(other, Lease):
            return False

        return (
            self.lease_id == other.lease_id
            and self.deployment_lease == other.deployment_lease
            and self.storage_lease == other.storage_lease
            and (self.deployment_lease_expiration == other.deployment_lease_expiration)
            and self.storage_lease_expiration == other.storage_lease_expiration
        )

    def __ne__(self, other):
        return not self == other


class InstantiateVAppXML:
    def __init__(
        self,
        name,
        template,
        net_href,
        cpus,
        memory,
        password=None,
        row=None,
        group=None,
    ):
        self.name = name
        self.template = template
        self.net_href = net_href
        self.cpus = cpus
        self.memory = memory
        self.password = password
        self.row = row
        self.group = group

        self._build_xmltree()

    def tostring(self):
        return ET.tostring(self.root)

    def _build_xmltree(self):
        self.root = self._make_instantiation_root()

        self._add_vapp_template(self.root)
        instantiation_params = ET.SubElement(self.root, "InstantiationParams")

        # product and virtual hardware
        self._make_product_section(instantiation_params)
        self._make_virtual_hardware(instantiation_params)

        network_config_section = ET.SubElement(instantiation_params, "NetworkConfigSection")

        network_config = ET.SubElement(network_config_section, "NetworkConfig")
        self._add_network_association(network_config)

    def _make_instantiation_root(self):
        return ET.Element(
            "InstantiateVAppTemplateParams",
            {
                "name": self.name,
                "xml:lang": "en",
                "xmlns": "http://www.vmware.com/vcloud/v0.8",
                "xmlns:xsi": "http://www.w3.org/2001/XMLSchema-instance",
            },
        )

    def _add_vapp_template(self, parent):
        return ET.SubElement(parent, "VAppTemplate", {"href": self.template})

    def _make_product_section(self, parent):
        prod_section = ET.SubElement(
            parent,
            "ProductSection",
            {
                "xmlns:q1": "http://www.vmware.com/vcloud/v0.8",
                "xmlns:ovf": "http://schemas.dmtf.org/ovf/envelope/1",
            },
        )

        if self.password:
            self._add_property(prod_section, "password", self.password)

        if self.row:
            self._add_property(prod_section, "row", self.row)

        if self.group:
            self._add_property(prod_section, "group", self.group)

        return prod_section

    def _add_property(self, parent, ovfkey, ovfvalue):
        return ET.SubElement(
            parent,
            "Property",
            {
                "xmlns": "http://schemas.dmtf.org/ovf/envelope/1",
                "ovf:key": ovfkey,
                "ovf:value": ovfvalue,
            },
        )

    def _make_virtual_hardware(self, parent):
        vh = ET.SubElement(
            parent,
            "VirtualHardwareSection",
            {"xmlns:q1": "http://www.vmware.com/vcloud/v0.8"},
        )

        self._add_cpu(vh)
        self._add_memory(vh)

        return vh

    def _add_cpu(self, parent):
        cpu_item = ET.SubElement(
            parent, "Item", {"xmlns": "http://schemas.dmtf.org/ovf/envelope/1"}
        )
        self._add_instance_id(cpu_item, "1")
        self._add_resource_type(cpu_item, "3")
        self._add_virtual_quantity(cpu_item, self.cpus)

        return cpu_item

    def _add_memory(self, parent):
        mem_item = ET.SubElement(
            parent, "Item", {"xmlns": "http://schemas.dmtf.org/ovf/envelope/1"}
        )
        self._add_instance_id(mem_item, "2")
        self._add_resource_type(mem_item, "4")
        self._add_virtual_quantity(mem_item, self.memory)

        return mem_item

    def _add_instance_id(self, parent, id):
        elm = ET.SubElement(
            parent,
            "InstanceID",
            {
                "xmlns": "http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/"
                "CIM_ResourceAllocationSettingData"
            },
        )
        elm.text = id

        return elm

    def _add_resource_type(self, parent, type):
        elm = ET.SubElement(
            parent,
            "ResourceType",
            {
                "xmlns": "http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/"
                "CIM_ResourceAllocationSettingData"
            },
        )
        elm.text = type

        return elm

    def _add_virtual_quantity(self, parent, amount):
        elm = ET.SubElement(
            parent,
            "VirtualQuantity",
            {
                "xmlns": "http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/"
                "CIM_ResourceAllocationSettingData"
            },
        )
        elm.text = amount

        return elm

    def _add_network_association(self, parent):
        return ET.SubElement(parent, "NetworkAssociation", {"href": self.net_href})


class VCloudResponse(XmlResponse):
    def success(self):
        return self.status in (
            httplib.OK,
            httplib.CREATED,
            httplib.NO_CONTENT,
            httplib.ACCEPTED,
        )


class VCloudConnection(ConnectionUserAndKey):
    """
    Connection class for the vCloud driver
    """

    responseCls = VCloudResponse
    token = None
    host = None

    def request(self, *args, **kwargs):
        self._get_auth_token()

        return super().request(*args, **kwargs)

    def check_org(self):
        # the only way to get our org is by logging in.
        self._get_auth_token()

    def _get_auth_headers(self):
        """Some providers need different headers than others"""

        return {
            "Authorization": "Basic %s"
            % base64.b64encode(b("{}:{}".format(self.user_id, self.key))).decode("utf-8"),
            "Content-Length": "0",
            "Accept": "application/*+xml",
        }

    def _get_auth_token(self):
        if not self.token:
            self.connection.request(
                method="POST", url="/api/v0.8/login", headers=self._get_auth_headers()
            )

            resp = self.connection.getresponse()
            headers = resp.headers
            body = ET.XML(resp.text)

            try:
                self.token = headers["set-cookie"]
            except KeyError:
                raise InvalidCredsError()

            self.driver.org = get_url_path(body.find(fixxpath(body, "Org")).get("href"))

    def add_default_headers(self, headers):
        headers["Cookie"] = self.token
        headers["Accept"] = "application/*+xml"

        return headers


class VCloudNodeDriver(NodeDriver):
    """
    vCloud node driver
    """

    type = Provider.VCLOUD
    name = "vCloud"
    website = "http://www.vmware.com/products/vcloud/"
    connectionCls = VCloudConnection
    org = None
    _vdcs = None

    NODE_STATE_MAP = {
        "0": NodeState.PENDING,
        "1": NodeState.PENDING,
        "2": NodeState.PENDING,
        "3": NodeState.PENDING,
        "4": NodeState.RUNNING,
    }

    features = {"create_node": ["password"]}

    def __new__(
        cls,
        key,
        secret=None,
        secure=True,
        host=None,
        port=None,
        api_version=DEFAULT_API_VERSION,
        **kwargs,
    ):
        if cls is VCloudNodeDriver:
            if api_version == "0.8":
                cls = VCloudNodeDriver
            elif api_version == "1.5":
                cls = VCloud_1_5_NodeDriver
            elif api_version == "5.1":
                cls = VCloud_5_1_NodeDriver
            elif api_version == "5.5":
                cls = VCloud_5_5_NodeDriver
            else:
                raise NotImplementedError(
                    "No VCloudNodeDriver found for API version %s" % (api_version)
                )

        return super().__new__(cls)

    @property
    def vdcs(self):
        """
        vCloud virtual data centers (vDCs).

        :return: list of vDC objects
        :rtype: ``list`` of :class:`Vdc`
        """

        if not self._vdcs:
            self.connection.check_org()  # make sure the org is set.
            res = self.connection.request(self.org)
            self._vdcs = [
                self._to_vdc(self.connection.request(get_url_path(i.get("href"))).object)
                for i in res.object.findall(fixxpath(res.object, "Link"))
                if i.get("type") == "application/vnd.vmware.vcloud.vdc+xml"
            ]

        return self._vdcs

    def _to_vdc(self, vdc_elm):
        return Vdc(vdc_elm.get("href"), vdc_elm.get("name"), self)

    def _get_vdc(self, vdc_name):
        vdc = None

        if not vdc_name:
            # Return the first organisation VDC found
            vdc = self.vdcs[0]
        else:
            for v in self.vdcs:
                if v.name == vdc_name or v.id == vdc_name:
                    vdc = v

            if vdc is None:
                raise ValueError("%s virtual data centre could not be found" % (vdc_name))

        return vdc

    @property
    def networks(self):
        networks = []

        for vdc in self.vdcs:
            res = self.connection.request(get_url_path(vdc.id)).object
            networks.extend(
                [network for network in res.findall(fixxpath(res, "AvailableNetworks/Network"))]
            )

        return networks

    def _to_image(self, image):
        image = NodeImage(
            id=image.get("href"), name=image.get("name"), driver=self.connection.driver
        )

        return image

    def _to_node(self, elm):
        state = self.NODE_STATE_MAP[elm.get("status")]
        name = elm.get("name")
        public_ips = []
        private_ips = []

        # Following code to find private IPs works for Terremark
        connections = elm.findall(
            "%s/%s"
            % (
                "{http://schemas.dmtf.org/ovf/envelope/1}NetworkConnectionSection",
                fixxpath(elm, "NetworkConnection"),
            )
        )

        if not connections:
            connections = elm.findall(
                fixxpath(elm, "Children/Vm/NetworkConnectionSection/NetworkConnection")
            )

        for connection in connections:
            ips = [ip.text for ip in connection.findall(fixxpath(elm, "IpAddress"))]

            if connection.get("Network") == "Internal":
                private_ips.extend(ips)
            else:
                public_ips.extend(ips)

        node = Node(
            id=elm.get("href"),
            name=name,
            state=state,
            public_ips=public_ips,
            private_ips=private_ips,
            driver=self.connection.driver,
        )

        return node

    def _get_catalog_hrefs(self):
        res = self.connection.request(self.org)
        catalogs = [
            i.get("href")
            for i in res.object.findall(fixxpath(res.object, "Link"))
            if i.get("type") == "application/vnd.vmware.vcloud.catalog+xml"
        ]

        return catalogs

    def _wait_for_task_completion(self, task_href, timeout=DEFAULT_TASK_COMPLETION_TIMEOUT):
        start_time = time.time()
        res = self.connection.request(get_url_path(task_href))
        status = res.object.get("status")

        while status != "success":
            if status == "error":
                # Get error reason from the response body
                error_elem = res.object.find(fixxpath(res.object, "Error"))
                error_msg = "Unknown error"

                if error_elem is not None:
                    error_msg = error_elem.get("message")
                raise Exception(
                    "Error status returned by task {}.: {}".format(task_href, error_msg)
                )

            if status == "canceled":
                raise Exception("Canceled status returned by task %s." % task_href)

            if time.time() - start_time >= timeout:
                raise Exception(
                    "Timeout ({} sec) while waiting for task {}.".format(timeout, task_href)
                )
            time.sleep(5)
            res = self.connection.request(get_url_path(task_href))
            status = res.object.get("status")

    def destroy_node(self, node):
        node_path = get_url_path(node.id)
        # blindly poweroff node, it will throw an exception if already off
        try:
            res = self.connection.request("%s/power/action/poweroff" % node_path, method="POST")
            self._wait_for_task_completion(res.object.get("href"))
        except Exception:
            pass

        try:
            res = self.connection.request("%s/action/undeploy" % node_path, method="POST")
            self._wait_for_task_completion(res.object.get("href"))
        except ExpatError:
            # The undeploy response is malformed XML atm.
            # We can remove this whent he providers fix the problem.
            pass
        except Exception:
            # Some vendors don't implement undeploy at all yet,
            # so catch this and move on.
            pass

        res = self.connection.request(node_path, method="DELETE")

        return res.status == httplib.ACCEPTED

    def reboot_node(self, node):
        res = self.connection.request(
            "%s/power/action/reset" % get_url_path(node.id), method="POST"
        )

        return res.status in [httplib.ACCEPTED, httplib.NO_CONTENT]

    def list_nodes(self):
        return self.ex_list_nodes()

    def ex_list_nodes(self, vdcs=None):
        """
        List all nodes across all vDCs. Using 'vdcs' you can specify which vDCs
        should be queried.

        :param vdcs: None, vDC or a list of vDCs to query. If None all vDCs
                     will be queried.
        :type vdcs: :class:`Vdc`

        :rtype: ``list`` of :class:`Node`
        """

        if not vdcs:
            vdcs = self.vdcs

        if not isinstance(vdcs, (list, tuple)):
            vdcs = [vdcs]
        nodes = []

        for vdc in vdcs:
            res = self.connection.request(get_url_path(vdc.id))
            elms = res.object.findall(fixxpath(res.object, "ResourceEntities/ResourceEntity"))
            vapps = [
                (i.get("name"), i.get("href"))
                for i in elms
                if i.get("type") == "application/vnd.vmware.vcloud.vApp+xml" and i.get("name")
            ]

            for vapp_name, vapp_href in vapps:
                try:
                    res = self.connection.request(
                        get_url_path(vapp_href),
                        headers={"Content-Type": "application/vnd.vmware.vcloud.vApp+xml"},
                    )
                    nodes.append(self._to_node(res.object))
                except Exception as e:
                    # The vApp was probably removed since the previous vDC
                    # query, ignore
                    # pylint: disable=no-member

                    if not (
                        e.args[0].tag.endswith("Error")
                        and e.args[0].get("minorErrorCode") == "ACCESS_TO_RESOURCE_IS_FORBIDDEN"
                    ):
                        raise

        return nodes

    def _to_size(self, ram):
        ns = NodeSize(
            id=None,
            name="%s Ram" % ram,
            ram=ram,
            disk=None,
            bandwidth=None,
            price=None,
            driver=self.connection.driver,
        )

        return ns

    def list_sizes(self, location=None):
        sizes = [self._to_size(i) for i in VIRTUAL_MEMORY_VALS]

        return sizes

    def _get_catalogitems_hrefs(self, catalog):
        """Given a catalog href returns contained catalog item hrefs"""
        res = self.connection.request(
            get_url_path(catalog),
            headers={"Content-Type": "application/vnd.vmware.vcloud.catalog+xml"},
        ).object

        cat_items = res.findall(fixxpath(res, "CatalogItems/CatalogItem"))
        cat_item_hrefs = [
            i.get("href")
            for i in cat_items
            if i.get("type") == "application/vnd.vmware.vcloud.catalogItem+xml"
        ]

        return cat_item_hrefs

    def _get_catalogitem(self, catalog_item):
        """Given a catalog item href returns elementree"""
        res = self.connection.request(
            get_url_path(catalog_item),
            headers={"Content-Type": "application/vnd.vmware.vcloud.catalogItem+xml"},
        ).object

        return res

    def list_images(self, location=None):
        images = []

        for vdc in self.vdcs:
            res = self.connection.request(get_url_path(vdc.id)).object
            res_ents = res.findall(fixxpath(res, "ResourceEntities/ResourceEntity"))
            images += [
                self._to_image(i)
                for i in res_ents
                if i.get("type") == "application/vnd.vmware.vcloud.vAppTemplate+xml"
            ]

        for catalog in self._get_catalog_hrefs():
            for cat_item in self._get_catalogitems_hrefs(catalog):
                res = self._get_catalogitem(cat_item)
                res_ents = res.findall(fixxpath(res, "Entity"))
                images += [
                    self._to_image(i)
                    for i in res_ents
                    if i.get("type") == "application/vnd.vmware.vcloud.vAppTemplate+xml"
                ]

        def idfun(image):
            return image.id

        return self._uniquer(images, idfun)

    def _uniquer(self, seq, idfun=None):
        if idfun is None:

            def idfun(x):  # pylint: disable=function-redefined
                return x

        seen = {}
        result = []

        for item in seq:
            marker = idfun(item)

            if marker in seen:
                continue
            seen[marker] = 1
            result.append(item)

        return result

    def create_node(
        self,
        name,
        size,
        image,
        auth=None,
        ex_network=None,
        ex_vdc=None,
        ex_cpus=1,
        ex_row=None,
        ex_group=None,
    ):
        """
        Creates and returns node.

        :keyword    ex_network: link to a "Network" e.g.,
                    ``https://services.vcloudexpress...``
        :type       ex_network: ``str``

        :keyword    ex_vdc: Name of organisation's virtual data
                            center where vApp VMs will be deployed.
        :type       ex_vdc: ``str``

        :keyword    ex_cpus: number of virtual cpus (limit depends on provider)
        :type       ex_cpus: ``int``

        :type       ex_row: ``str``

        :type       ex_group: ``str``
        """
        # Some providers don't require a network link
        try:
            network = ex_network or self.networks[0].get("href")
        except IndexError:
            network = ""

        password = None
        auth = self._get_and_check_auth(auth)
        password = auth.password

        instantiate_xml = InstantiateVAppXML(
            name=name,
            template=image.id,
            net_href=network,
            cpus=str(ex_cpus),
            memory=str(size.ram),
            password=password,
            row=ex_row,
            group=ex_group,
        )

        vdc = self._get_vdc(ex_vdc)

        # Instantiate VM and get identifier.
        content_type = "application/vnd.vmware.vcloud.instantiateVAppTemplateParams+xml"
        res = self.connection.request(
            "%s/action/instantiateVAppTemplate" % get_url_path(vdc.id),
            data=instantiate_xml.tostring(),
            method="POST",
            headers={"Content-Type": content_type},
        )
        vapp_path = get_url_path(res.object.get("href"))

        # Deploy the VM from the identifier.
        res = self.connection.request("%s/action/deploy" % vapp_path, method="POST")

        self._wait_for_task_completion(res.object.get("href"))

        # Power on the VM.
        res = self.connection.request("%s/power/action/powerOn" % vapp_path, method="POST")

        res = self.connection.request(vapp_path)
        node = self._to_node(res.object)

        if getattr(auth, "generated", False):
            node.extra["password"] = auth.password

        return node


class HostingComConnection(VCloudConnection):
    """
    vCloud connection subclass for Hosting.com
    """

    host = "vcloud.safesecureweb.com"

    def _get_auth_headers(self):
        """hosting.com doesn't follow the standard vCloud authentication API"""

        return {
            "Authentication": base64.b64encode(b("{}:{}".format(self.user_id, self.key))),
            "Content-Length": "0",
        }


class HostingComDriver(VCloudNodeDriver):
    """
    vCloud node driver for Hosting.com
    """

    connectionCls = HostingComConnection


class TerremarkConnection(VCloudConnection):
    """
    vCloud connection subclass for Terremark
    """

    host = "services.vcloudexpress.terremark.com"


class TerremarkDriver(VCloudNodeDriver):
    """
    vCloud node driver for Terremark
    """

    connectionCls = TerremarkConnection

    def list_locations(self):
        return [NodeLocation(0, "Terremark Texas", "US", self)]


class VCloud_1_5_Connection(VCloudConnection):
    def _get_auth_headers(self):
        """Compatibility for using v1.5 API under vCloud Director 5.1"""

        return {
            "Authorization": "Basic %s"
            % base64.b64encode(b("{}:{}".format(self.user_id, self.key))).decode("utf-8"),
            "Content-Length": "0",
            "Accept": "application/*+xml;version=1.5",
        }

    def _get_auth_token(self):
        if not self.token:
            # Log In
            self.connection.request(
                method="POST", url="/api/sessions", headers=self._get_auth_headers()
            )

            resp = self.connection.getresponse()
            headers = resp.headers

            # Set authorization token
            try:
                self.token = headers["x-vcloud-authorization"]
            except KeyError:
                raise InvalidCredsError()

            # Get the URL of the Organization
            body = ET.XML(resp.text)
            self.org_name = body.get("org")

            # pylint: disable=no-member
            org_list_url = get_url_path(
                next(
                    link
                    for link in body.findall(fixxpath(body, "Link"))
                    if link.get("type") == "application/vnd.vmware.vcloud.orgList+xml"
                ).get("href")
            )

            if self.proxy_url is not None:
                self.connection.set_http_proxy(self.proxy_url)
            self.connection.request(
                method="GET", url=org_list_url, headers=self.add_default_headers({})
            )
            body = ET.XML(self.connection.getresponse().text)

            # pylint: disable=no-member
            self.driver.org = get_url_path(
                next(
                    org
                    for org in body.findall(fixxpath(body, "Org"))
                    if org.get("name") == self.org_name
                ).get("href")
            )

    def add_default_headers(self, headers):
        headers["Accept"] = "application/*+xml;version=1.5"
        headers["x-vcloud-authorization"] = self.token

        return headers


class VCloud_5_5_Connection(VCloud_1_5_Connection):
    def _get_auth_headers(self):
        """Compatibility for using v5.5 of the API"""
        auth_headers = super()._get_auth_headers()
        auth_headers["Accept"] = "application/*+xml;version=5.5"

        return auth_headers

    def add_default_headers(self, headers):
        headers["Accept"] = "application/*+xml;version=5.5"
        headers["x-vcloud-authorization"] = self.token

        return headers


class Instantiate_1_5_VAppXML:
    def __init__(self, name, template, network, vm_network=None, vm_fence=None, description=None):
        self.name = name
        self.template = template
        self.network = network
        self.vm_network = vm_network
        self.vm_fence = vm_fence
        self.description = description
        self._build_xmltree()

    def tostring(self):
        return ET.tostring(self.root)

    def _build_xmltree(self):
        self.root = self._make_instantiation_root()

        if self.network is not None:
            instantiation_params = ET.SubElement(self.root, "InstantiationParams")
            network_config_section = ET.SubElement(instantiation_params, "NetworkConfigSection")
            ET.SubElement(
                network_config_section,
                "Info",
                {"xmlns": "http://schemas.dmtf.org/ovf/envelope/1"},
            )
            network_config = ET.SubElement(network_config_section, "NetworkConfig")
            self._add_network_association(network_config)

        if self.description is not None:
            ET.SubElement(self.root, "Description").text = self.description

        self._add_vapp_template(self.root)

    def _make_instantiation_root(self):
        return ET.Element(
            "InstantiateVAppTemplateParams",
            {
                "name": self.name,
                "deploy": "false",
                "powerOn": "false",
                "xml:lang": "en",
                "xmlns": "http://www.vmware.com/vcloud/v1.5",
                "xmlns:xsi": "http://www.w3.org/2001/XMLSchema-instance",
            },
        )

    def _add_vapp_template(self, parent):
        return ET.SubElement(parent, "Source", {"href": self.template})

    def _add_network_association(self, parent):
        if self.vm_network is None:
            # Don't set a custom vApp VM network name
            parent.set("networkName", self.network.get("name"))
        else:
            # Set a custom vApp VM network name
            parent.set("networkName", self.vm_network)
        configuration = ET.SubElement(parent, "Configuration")
        ET.SubElement(configuration, "ParentNetwork", {"href": self.network.get("href")})

        if self.vm_fence is None:
            fencemode = self.network.find(fixxpath(self.network, "Configuration/FenceMode")).text
        else:
            fencemode = self.vm_fence
        ET.SubElement(configuration, "FenceMode").text = fencemode


class VCloud_1_5_NodeDriver(VCloudNodeDriver):
    connectionCls = VCloud_1_5_Connection

    # Based on
    # http://pubs.vmware.com/vcloud-api-1-5/api_prog/
    # GUID-843BE3AD-5EF6-4442-B864-BCAE44A51867.html
    NODE_STATE_MAP = {
        "-1": NodeState.UNKNOWN,
        "0": NodeState.PENDING,
        "1": NodeState.PENDING,
        "2": NodeState.PENDING,
        "3": NodeState.PENDING,
        "4": NodeState.RUNNING,
        "5": NodeState.RUNNING,
        "6": NodeState.UNKNOWN,
        "7": NodeState.UNKNOWN,
        "8": NodeState.STOPPED,
        "9": NodeState.UNKNOWN,
        "10": NodeState.UNKNOWN,
    }

    def list_locations(self):
        return [
            NodeLocation(
                id=self.connection.host,
                name=self.connection.host,
                country="N/A",
                driver=self,
            )
        ]

    def ex_find_node(self, node_name, vdcs=None):
        """
        Searches for node across specified vDCs. This is more effective than
        querying all nodes to get a single instance.

        :param node_name: The name of the node to search for
        :type node_name: ``str``

        :param vdcs: None, vDC or a list of vDCs to search in. If None all vDCs
                     will be searched.
        :type vdcs: :class:`Vdc`

        :return: node instance or None if not found
        :rtype: :class:`Node` or ``None``
        """

        if not vdcs:
            vdcs = self.vdcs

        if not getattr(vdcs, "__iter__", False):
            vdcs = [vdcs]

        for vdc in vdcs:
            res = self.connection.request(get_url_path(vdc.id))
            xpath = fixxpath(res.object, "ResourceEntities/ResourceEntity")
            entity_elems = res.object.findall(xpath)

            for entity_elem in entity_elems:
                if (
                    entity_elem.get("type") == "application/vnd.vmware.vcloud.vApp+xml"
                    and entity_elem.get("name") == node_name
                ):
                    path = entity_elem.get("href")

                    return self._ex_get_node(path)

        return None

    def ex_find_vm_nodes(self, vm_name, max_results=50):
        """
        Finds nodes that contain a VM with the specified name.

        :param vm_name: The VM name to find nodes for
        :type vm_name: ``str``

        :param max_results: Maximum number of results up to 128
        :type max_results: ``int``

        :return: List of node instances
        :rtype: `list` of :class:`Node`
        """
        vms = self.ex_query(
            "vm",
            filter="name=={vm_name}".format(vm_name=vm_name),
            page=1,
            page_size=max_results,
        )

        return [self._ex_get_node(vm["container"]) for vm in vms]

    def destroy_node(self, node, shutdown=True):
        try:
            self.ex_undeploy_node(node, shutdown=shutdown)
        except Exception:
            # Some vendors don't implement undeploy at all yet,
            # so catch this and move on.
            pass

        res = self.connection.request(get_url_path(node.id), method="DELETE")

        return res.status == httplib.ACCEPTED

    def reboot_node(self, node):
        res = self.connection.request(
            "%s/power/action/reset" % get_url_path(node.id), method="POST"
        )

        if res.status in [httplib.ACCEPTED, httplib.NO_CONTENT]:
            self._wait_for_task_completion(res.object.get("href"))

            return True
        else:
            return False

    def ex_deploy_node(self, node, ex_force_customization=False):
        """
        Deploys existing node. Equal to vApp "start" operation.

        :param  node: The node to be deployed
        :type   node: :class:`Node`

        :param  ex_force_customization: Used to specify whether to force
                                        customization on deployment,
                                        if not set default value is False.
        :type   ex_force_customization: ``bool``

        :rtype: :class:`Node`
        """

        if ex_force_customization:
            vms = self._get_vm_elements(node.id)

            for vm in vms:
                self._ex_deploy_node_or_vm(vm.get("href"), ex_force_customization=True)
        else:
            self._ex_deploy_node_or_vm(node.id)

        res = self.connection.request(get_url_path(node.id))

        return self._to_node(res.object)

    def _ex_deploy_node_or_vm(self, vapp_or_vm_path, ex_force_customization=False):
        data = {
            "powerOn": "true",
            "forceCustomization": str(ex_force_customization).lower(),
            "xmlns": "http://www.vmware.com/vcloud/v1.5",
        }
        deploy_xml = ET.Element("DeployVAppParams", data)
        path = get_url_path(vapp_or_vm_path)
        headers = {"Content-Type": "application/vnd.vmware.vcloud.deployVAppParams+xml"}
        res = self.connection.request(
            "%s/action/deploy" % path,
            data=ET.tostring(deploy_xml),
            method="POST",
            headers=headers,
        )
        self._wait_for_task_completion(res.object.get("href"))

    def ex_undeploy_node(self, node, shutdown=True):
        """
        Undeploys existing node. Equal to vApp "stop" operation.

        :param  node: The node to be deployed
        :type   node: :class:`Node`

        :param  shutdown: Whether to shutdown or power off the guest when
                undeploying
        :type   shutdown: ``bool``

        :rtype: :class:`Node`
        """
        data = {"xmlns": "http://www.vmware.com/vcloud/v1.5"}
        undeploy_xml = ET.Element("UndeployVAppParams", data)
        undeploy_power_action_xml = ET.SubElement(undeploy_xml, "UndeployPowerAction")

        headers = {"Content-Type": "application/vnd.vmware.vcloud.undeployVAppParams+xml"}

        def undeploy(action):
            undeploy_power_action_xml.text = action
            undeploy_res = self.connection.request(
                "%s/action/undeploy" % get_url_path(node.id),
                data=ET.tostring(undeploy_xml),
                method="POST",
                headers=headers,
            )
            self._wait_for_task_completion(undeploy_res.object.get("href"))

        if shutdown:
            try:
                undeploy("shutdown")
            except Exception:
                undeploy("powerOff")
        else:
            undeploy("powerOff")

        res = self.connection.request(get_url_path(node.id))

        return self._to_node(res.object)

    def ex_power_off_node(self, node):
        """
        Powers on all VMs under specified node. VMs need to be This operation
        is allowed only when the vApp/VM is powered on.

        :param  node: The node to be powered off
        :type   node: :class:`Node`

        :rtype: :class:`Node`
        """

        return self._perform_power_operation(node, "powerOff")

    def ex_power_on_node(self, node):
        """
        Powers on all VMs under specified node. This operation is allowed
        only when the vApp/VM is powered off or suspended.

        :param  node: The node to be powered on
        :type   node: :class:`Node`

        :rtype: :class:`Node`
        """

        return self._perform_power_operation(node, "powerOn")

    def ex_shutdown_node(self, node):
        """
        Shutdowns all VMs under specified node. This operation is allowed only
        when the vApp/VM is powered on.

        :param  node: The node to be shut down
        :type   node: :class:`Node`

        :rtype: :class:`Node`
        """

        return self._perform_power_operation(node, "shutdown")

    def ex_suspend_node(self, node):
        """
        Suspends all VMs under specified node. This operation is allowed only
        when the vApp/VM is powered on.

        :param  node: The node to be suspended
        :type   node: :class:`Node`

        :rtype: :class:`Node`
        """

        return self._perform_power_operation(node, "suspend")

    def _perform_power_operation(self, node, operation):
        res = self.connection.request(
            "{}/power/action/{}".format(get_url_path(node.id), operation), method="POST"
        )
        self._wait_for_task_completion(res.object.get("href"))
        res = self.connection.request(get_url_path(node.id))

        return self._to_node(res.object)

    def ex_get_control_access(self, node):
        """
        Returns the control access settings for specified node.

        :param  node: node to get the control access for
        :type   node: :class:`Node`

        :rtype: :class:`ControlAccess`
        """
        res = self.connection.request("%s/controlAccess" % get_url_path(node.id))
        everyone_access_level = None
        is_shared_elem = res.object.find(fixxpath(res.object, "IsSharedToEveryone"))

        if is_shared_elem is not None and is_shared_elem.text == "true":
            everyone_access_level = res.object.find(
                fixxpath(res.object, "EveryoneAccessLevel")
            ).text

        # Parse all subjects
        subjects = []
        xpath = fixxpath(res.object, "AccessSettings/AccessSetting")

        for elem in res.object.findall(xpath):
            access_level = elem.find(fixxpath(res.object, "AccessLevel")).text
            subject_elem = elem.find(fixxpath(res.object, "Subject"))

            if subject_elem.get("type") == "application/vnd.vmware.admin.group+xml":
                subj_type = "group"
            else:
                subj_type = "user"

            path = get_url_path(subject_elem.get("href"))
            res = self.connection.request(path)
            name = res.object.get("name")
            subject = Subject(
                type=subj_type,
                name=name,
                access_level=access_level,
                id=subject_elem.get("href"),
            )
            subjects.append(subject)

        return ControlAccess(node, everyone_access_level, subjects)

    def ex_set_control_access(self, node, control_access):
        """
        Sets control access for the specified node.

        :param  node: node
        :type   node: :class:`Node`

        :param  control_access: control access settings
        :type   control_access: :class:`ControlAccess`

        :rtype: ``None``
        """
        xml = ET.Element("ControlAccessParams", {"xmlns": "http://www.vmware.com/vcloud/v1.5"})
        shared_to_everyone = ET.SubElement(xml, "IsSharedToEveryone")

        if control_access.everyone_access_level:
            shared_to_everyone.text = "true"
            everyone_access_level = ET.SubElement(xml, "EveryoneAccessLevel")
            everyone_access_level.text = control_access.everyone_access_level
        else:
            shared_to_everyone.text = "false"

        # Set subjects

        if control_access.subjects:
            access_settings_elem = ET.SubElement(xml, "AccessSettings")

        for subject in control_access.subjects:
            setting = ET.SubElement(access_settings_elem, "AccessSetting")

            if subject.id:
                href = subject.id
            else:
                res = self.ex_query(type=subject.type, filter="name==" + subject.name)

                if not res:
                    raise LibcloudError(
                        'Specified subject "{} {}" not found '.format(subject.type, subject.name)
                    )
                href = res[0]["href"]
            ET.SubElement(setting, "Subject", {"href": href})
            ET.SubElement(setting, "AccessLevel").text = subject.access_level

        headers = {"Content-Type": "application/vnd.vmware.vcloud.controlAccess+xml"}
        self.connection.request(
            "%s/action/controlAccess" % get_url_path(node.id),
            data=ET.tostring(xml),
            headers=headers,
            method="POST",
        )

    def ex_get_metadata(self, node):
        """
        :param  node: node
        :type   node: :class:`Node`

        :return: dictionary mapping metadata keys to metadata values
        :rtype: dictionary mapping ``str`` to ``str``
        """
        res = self.connection.request("%s/metadata" % (get_url_path(node.id)))
        xpath = fixxpath(res.object, "MetadataEntry")
        metadata_entries = res.object.findall(xpath)
        res_dict = {}

        for entry in metadata_entries:
            key = entry.findtext(fixxpath(res.object, "Key"))
            value = entry.findtext(fixxpath(res.object, "Value"))
            res_dict[key] = value

        return res_dict

    def ex_set_metadata_entry(self, node, key, value):
        """
        :param  node: node
        :type   node: :class:`Node`

        :param key: metadata key to be set
        :type key: ``str``

        :param value: metadata value to be set
        :type value: ``str``

        :rtype: ``None``
        """
        metadata_elem = ET.Element(
            "Metadata",
            {
                "xmlns": "http://www.vmware.com/vcloud/v1.5",
                "xmlns:xsi": "http://www.w3.org/2001/XMLSchema-instance",
            },
        )
        entry = ET.SubElement(metadata_elem, "MetadataEntry")
        key_elem = ET.SubElement(entry, "Key")
        key_elem.text = key
        value_elem = ET.SubElement(entry, "Value")
        value_elem.text = value

        # send it back to the server
        res = self.connection.request(
            "%s/metadata" % get_url_path(node.id),
            data=ET.tostring(metadata_elem),
            headers={"Content-Type": "application/vnd.vmware.vcloud.metadata+xml"},
            method="POST",
        )
        self._wait_for_task_completion(res.object.get("href"))

    def ex_query(self, type, filter=None, page=1, page_size=100, sort_asc=None, sort_desc=None):
        """
        Queries vCloud for specified type. See
        http://www.vmware.com/pdf/vcd_15_api_guide.pdf for details. Each
        element of the returned list is a dictionary with all attributes from
        the record.

        :param type: type to query (r.g. user, group, vApp etc.)
        :type  type: ``str``

        :param filter: filter expression (see documentation for syntax)
        :type  filter: ``str``

        :param page: page number
        :type  page: ``int``

        :param page_size: page size
        :type  page_size: ``int``

        :param sort_asc: sort in ascending order by specified field
        :type  sort_asc: ``str``

        :param sort_desc: sort in descending order by specified field
        :type  sort_desc: ``str``

        :rtype: ``list`` of dict
        """
        # This is a workaround for filter parameter encoding
        # the urllib encodes (name==Developers%20Only) into
        # %28name%3D%3DDevelopers%20Only%29) which is not accepted by vCloud
        params = {
            "type": type,
            "pageSize": page_size,
            "page": page,
        }

        if sort_asc:
            params["sortAsc"] = sort_asc

        if sort_desc:
            params["sortDesc"] = sort_desc

        url = "/api/query?" + urlencode(params)

        if filter:
            if not filter.startswith("("):
                filter = "(" + filter + ")"
            url += "&filter=" + filter.replace(" ", "+")

        results = []
        res = self.connection.request(url)

        for elem in res.object:
            if not elem.tag.endswith("Link"):
                result = elem.attrib
                result["type"] = elem.tag.split("}")[1]
                results.append(result)

        return results

    def create_node(self, **kwargs):
        """
        Creates and returns node. If the source image is:
          - vApp template - a new vApp is instantiated from template
          - existing vApp - a new vApp is cloned from the source vApp. Can
                            not clone more vApps is parallel otherwise
                            resource busy error is raised.


        @inherits: :class:`NodeDriver.create_node`

        :keyword    image:  OS Image to boot on node. (required). Can be a
                            NodeImage or existing Node that will be cloned.
        :type       image:  :class:`NodeImage` or :class:`Node`

        :keyword    ex_network: Organisation's network name for attaching vApp
                                VMs to.
        :type       ex_network: ``str``

        :keyword    ex_vdc: Name of organisation's virtual data center where
                            vApp VMs will be deployed.
        :type       ex_vdc: ``str``

        :keyword    ex_vm_names: list of names to be used as a VM and computer
                                 name. The name must be max. 15 characters
                                 long and follow the host name requirements.
        :type       ex_vm_names: ``list`` of ``str``

        :keyword    ex_vm_cpu: number of virtual CPUs/cores to allocate for
                               each vApp VM.
        :type       ex_vm_cpu: ``int``

        :keyword    ex_vm_memory: amount of memory in MB to allocate for each
                                  vApp VM.
        :type       ex_vm_memory: ``int``

        :keyword    ex_vm_script: full path to file containing guest
                                  customisation script for each vApp VM.
                                  Useful for creating users & pushing out
                                  public SSH keys etc.
        :type       ex_vm_script: ``str``

        :keyword    ex_vm_script_text: content of guest customisation script
                                       for each vApp VM. Overrides ex_vm_script
                                       parameter.
        :type       ex_vm_script_text: ``str``

        :keyword    ex_vm_network: Override default vApp VM network name.
                                   Useful for when you've imported an OVF
                                   originating from outside of the vCloud.
        :type       ex_vm_network: ``str``

        :keyword    ex_vm_fence: Fence mode for connecting the vApp VM network
                                 (ex_vm_network) to the parent
                                 organisation network (ex_network).
        :type       ex_vm_fence: ``str``

        :keyword    ex_vm_ipmode: IP address allocation mode for all vApp VM
                                  network connections.
        :type       ex_vm_ipmode: ``str``

        :keyword    ex_deploy: set to False if the node shouldn't be deployed
                               (started) after creation
        :type       ex_deploy: ``bool``

        :keyword    ex_force_customization: Used to specify whether to force
                                            customization on deployment,
                                            if not set default value is False.
        :type       ex_force_customization: ``bool``

        :keyword    ex_clone_timeout: timeout in seconds for clone/instantiate
                                      VM operation.
                                      Cloning might be a time consuming
                                      operation especially when linked clones
                                      are disabled or VMs are created on
                                      different datastores.
                                      Overrides the default task completion
                                      value.
        :type       ex_clone_timeout: ``int``

        :keyword    ex_admin_password: set the node admin password explicitly.
        :type       ex_admin_password: ``str``

        :keyword    ex_description: Set a description for the vApp.
        :type       ex_description: ``str``
        """
        name = kwargs["name"]
        image = kwargs["image"]
        ex_vm_names = kwargs.get("ex_vm_names")
        ex_vm_cpu = kwargs.get("ex_vm_cpu")
        ex_vm_memory = kwargs.get("ex_vm_memory")
        ex_vm_script = kwargs.get("ex_vm_script")
        ex_vm_script_text = kwargs.get("ex_vm_script_text", None)
        ex_vm_fence = kwargs.get("ex_vm_fence", None)
        ex_network = kwargs.get("ex_network", None)
        ex_vm_network = kwargs.get("ex_vm_network", None)
        ex_vm_ipmode = kwargs.get("ex_vm_ipmode", None)
        ex_deploy = kwargs.get("ex_deploy", True)
        ex_force_customization = kwargs.get("ex_force_customization", False)
        ex_vdc = kwargs.get("ex_vdc", None)
        ex_clone_timeout = kwargs.get("ex_clone_timeout", DEFAULT_TASK_COMPLETION_TIMEOUT)
        ex_admin_password = kwargs.get("ex_admin_password", None)
        ex_description = kwargs.get("ex_description", None)

        self._validate_vm_names(ex_vm_names)
        self._validate_vm_cpu(ex_vm_cpu)
        self._validate_vm_memory(ex_vm_memory)
        self._validate_vm_fence(ex_vm_fence)
        self._validate_vm_ipmode(ex_vm_ipmode)
        ex_vm_script = self._validate_vm_script(ex_vm_script)

        # Some providers don't require a network link

        if ex_network:
            network_href = self._get_network_href(ex_network)
            network_elem = self.connection.request(get_url_path(network_href)).object
        else:
            network_elem = None

        vdc = self._get_vdc(ex_vdc)

        if self._is_node(image):
            vapp_name, vapp_href = self._clone_node(name, image, vdc, ex_clone_timeout)
        else:
            vapp_name, vapp_href = self._instantiate_node(
                name,
                image,
                network_elem,
                vdc,
                ex_vm_network,
                ex_vm_fence,
                ex_clone_timeout,
                description=ex_description,
            )

        self._change_vm_names(vapp_href, ex_vm_names)
        self._change_vm_cpu(vapp_href, ex_vm_cpu)
        self._change_vm_memory(vapp_href, ex_vm_memory)
        self._change_vm_script(vapp_href, ex_vm_script, ex_vm_script_text)
        self._change_vm_ipmode(vapp_href, ex_vm_ipmode)

        if ex_admin_password is not None:
            self.ex_change_vm_admin_password(vapp_href, ex_admin_password)

        # Power on the VM.

        if ex_deploy:
            res = self.connection.request(get_url_path(vapp_href))
            node = self._to_node(res.object)
            # Retry 3 times: when instantiating large number of VMs at the same
            # time some may fail on resource allocation
            retry = 3

            while True:
                try:
                    self.ex_deploy_node(node, ex_force_customization)

                    break
                except Exception:
                    if retry <= 0:
                        raise
                    retry -= 1
                    time.sleep(10)

        res = self.connection.request(get_url_path(vapp_href))
        node = self._to_node(res.object)

        return node

    def _instantiate_node(
        self,
        name,
        image,
        network_elem,
        vdc,
        vm_network,
        vm_fence,
        instantiate_timeout,
        description=None,
    ):
        instantiate_xml = Instantiate_1_5_VAppXML(
            name=name,
            template=image.id,
            network=network_elem,
            vm_network=vm_network,
            vm_fence=vm_fence,
            description=description,
        )

        # Instantiate VM and get identifier.
        headers = {
            "Content-Type": "application/vnd.vmware.vcloud.instantiateVAppTemplateParams+xml"
        }
        res = self.connection.request(
            "%s/action/instantiateVAppTemplate" % get_url_path(vdc.id),
            data=instantiate_xml.tostring(),
            method="POST",
            headers=headers,
        )
        vapp_name = res.object.get("name")
        vapp_href = res.object.get("href")

        task_href = res.object.find(fixxpath(res.object, "Tasks/Task")).get("href")
        self._wait_for_task_completion(task_href, instantiate_timeout)

        return vapp_name, vapp_href

    def _clone_node(self, name, sourceNode, vdc, clone_timeout):
        clone_xml = ET.Element(
            "CloneVAppParams",
            {
                "name": name,
                "deploy": "false",
                "powerOn": "false",
                "xmlns": "http://www.vmware.com/vcloud/v1.5",
                "xmlns:xsi": "http://www.w3.org/2001/XMLSchema-instance",
            },
        )
        ET.SubElement(clone_xml, "Description").text = "Clone of " + sourceNode.name
        ET.SubElement(clone_xml, "Source", {"href": sourceNode.id})

        headers = {"Content-Type": "application/vnd.vmware.vcloud.cloneVAppParams+xml"}
        res = self.connection.request(
            "%s/action/cloneVApp" % get_url_path(vdc.id),
            data=ET.tostring(clone_xml),
            method="POST",
            headers=headers,
        )
        vapp_name = res.object.get("name")
        vapp_href = res.object.get("href")

        task_href = res.object.find(fixxpath(res.object, "Tasks/Task")).get("href")
        self._wait_for_task_completion(task_href, clone_timeout)

        res = self.connection.request(get_url_path(vapp_href))

        vms = res.object.findall(fixxpath(res.object, "Children/Vm"))

        # Fix the networking for VMs

        for i, vm in enumerate(vms):
            # Remove network
            network_xml = ET.Element(
                "NetworkConnectionSection",
                {
                    "ovf:required": "false",
                    "xmlns": "http://www.vmware.com/vcloud/v1.5",
                    "xmlns:ovf": "http://schemas.dmtf.org/ovf/envelope/1",
                },
            )
            ET.SubElement(network_xml, "ovf:Info").text = (
                "Specifies the available VM network connections"
            )

            headers = {"Content-Type": "application/vnd.vmware.vcloud.networkConnectionSection+xml"}
            res = self.connection.request(
                "%s/networkConnectionSection" % get_url_path(vm.get("href")),
                data=ET.tostring(network_xml),
                method="PUT",
                headers=headers,
            )
            self._wait_for_task_completion(res.object.get("href"))

            # Re-add network
            network_xml = vm.find(fixxpath(vm, "NetworkConnectionSection"))
            network_conn_xml = network_xml.find(fixxpath(network_xml, "NetworkConnection"))
            network_conn_xml.set("needsCustomization", "true")
            network_conn_xml.remove(network_conn_xml.find(fixxpath(network_xml, "IpAddress")))
            network_conn_xml.remove(network_conn_xml.find(fixxpath(network_xml, "MACAddress")))

            headers = {"Content-Type": "application/vnd.vmware.vcloud.networkConnectionSection+xml"}
            res = self.connection.request(
                "%s/networkConnectionSection" % get_url_path(vm.get("href")),
                data=ET.tostring(network_xml),
                method="PUT",
                headers=headers,
            )
            self._wait_for_task_completion(res.object.get("href"))

        return vapp_name, vapp_href

    def ex_set_vm_cpu(self, vapp_or_vm_id, vm_cpu):
        """
        Sets the number of virtual CPUs for the specified VM or VMs under
        the vApp. If the vapp_or_vm_id param represents a link to an vApp
        all VMs that are attached to this vApp will be modified.

        Please ensure that hot-adding a virtual CPU is enabled for the
        powered on virtual machines. Otherwise use this method on undeployed
        vApp.

        :keyword    vapp_or_vm_id: vApp or VM ID that will be modified. If
                                   a vApp ID is used here all attached VMs
                                   will be modified
        :type       vapp_or_vm_id: ``str``

        :keyword    vm_cpu: number of virtual CPUs/cores to allocate for
                            specified VMs
        :type       vm_cpu: ``int``

        :rtype: ``None``
        """
        self._validate_vm_cpu(vm_cpu)
        self._change_vm_cpu(vapp_or_vm_id, vm_cpu)

    def ex_set_vm_memory(self, vapp_or_vm_id, vm_memory):
        """
        Sets the virtual memory in MB to allocate for the specified VM or
        VMs under the vApp. If the vapp_or_vm_id param represents a link
        to an vApp all VMs that are attached to this vApp will be modified.

        Please ensure that hot-change of virtual memory is enabled for the
        powered on virtual machines. Otherwise use this method on undeployed
        vApp.

        :keyword    vapp_or_vm_id: vApp or VM ID that will be modified. If
                                   a vApp ID is used here all attached VMs
                                   will be modified
        :type       vapp_or_vm_id: ``str``

        :keyword    vm_memory: virtual memory in MB to allocate for the
                               specified VM or VMs
        :type       vm_memory: ``int``

        :rtype: ``None``
        """
        self._validate_vm_memory(vm_memory)
        self._change_vm_memory(vapp_or_vm_id, vm_memory)

    def ex_add_vm_disk(self, vapp_or_vm_id, vm_disk_size):
        """
        Adds a virtual disk to the specified VM or VMs under the vApp. If the
        vapp_or_vm_id param represents a link to an vApp all VMs that are
        attached to this vApp will be modified.

        :keyword    vapp_or_vm_id: vApp or VM ID that will be modified. If a
                                   vApp ID is used here all attached VMs
                                   will be modified
        :type       vapp_or_vm_id: ``str``

        :keyword    vm_disk_size: the disk capacity in GB that will be added
                                  to the specified VM or VMs
        :type       vm_disk_size: ``int``

        :rtype: ``None``
        """
        self._validate_vm_disk_size(vm_disk_size)
        self._add_vm_disk(vapp_or_vm_id, vm_disk_size)

    @staticmethod
    def _validate_vm_names(names):
        if names is None:
            return

        for name in names:
            if len(name) > 15:
                raise ValueError(
                    'The VM name "' + name + '" is too long for the computer '
                    "name (max 15 chars allowed)."
                )

            if not HOSTNAME_RE.match(name):
                raise ValueError(
                    'The VM name "' + name + '" can not be '
                    'used. "' + name + '" is not a valid '
                    "computer name for the VM."
                )

        return True

    @staticmethod
    def _validate_vm_memory(vm_memory):
        if vm_memory is None:
            return
        elif vm_memory not in VIRTUAL_MEMORY_VALS:
            raise ValueError("%s is not a valid vApp VM memory value" % vm_memory)

    @staticmethod
    def _validate_vm_cpu(vm_cpu):
        if vm_cpu is None:
            return
        elif vm_cpu not in VIRTUAL_CPU_VALS_1_5:
            raise ValueError("%s is not a valid vApp VM CPU value" % vm_cpu)

    @staticmethod
    def _validate_vm_disk_size(vm_disk):
        if vm_disk is None:
            return
        elif int(vm_disk) < 0:
            raise ValueError("%s is not a valid vApp VM disk space value", vm_disk)

    @staticmethod
    def _validate_vm_script(vm_script):
        if vm_script is None:
            return
        # Try to locate the script file

        if not os.path.isabs(vm_script):
            vm_script = os.path.expanduser(vm_script)
            vm_script = os.path.abspath(vm_script)

        if not os.path.isfile(vm_script):
            raise LibcloudError("%s the VM script file does not exist" % vm_script)
        try:
            open(vm_script).read()
        except Exception:
            raise

        return vm_script

    @staticmethod
    def _validate_vm_fence(vm_fence):
        if vm_fence is None:
            return
        elif vm_fence not in FENCE_MODE_VALS_1_5:
            raise ValueError("%s is not a valid fencing mode value" % vm_fence)

    @staticmethod
    def _validate_vm_ipmode(vm_ipmode):
        if vm_ipmode is None:
            return
        elif vm_ipmode == "MANUAL":
            raise NotImplementedError(
                "MANUAL IP mode: The interface for supplying " "IPAddress does not exist yet"
            )
        elif vm_ipmode not in IP_MODE_VALS_1_5:
            raise ValueError("%s is not a valid IP address allocation mode value" % vm_ipmode)

    def _change_vm_names(self, vapp_or_vm_id, vm_names):
        if vm_names is None:
            return

        vms = self._get_vm_elements(vapp_or_vm_id)

        for i, vm in enumerate(vms):
            if len(vm_names) <= i:
                return

            # Get GuestCustomizationSection
            res = self.connection.request(
                "%s/guestCustomizationSection" % get_url_path(vm.get("href"))
            )

            # Update GuestCustomizationSection
            res.object.find(fixxpath(res.object, "ComputerName")).text = vm_names[i]
            # Remove AdminPassword from customization section if it would be
            # invalid to include it
            self._remove_admin_password(res.object)

            headers = {
                "Content-Type": "application/vnd.vmware.vcloud.guestCustomizationSection+xml"
            }
            res = self.connection.request(
                "%s/guestCustomizationSection" % get_url_path(vm.get("href")),
                data=ET.tostring(res.object),
                method="PUT",
                headers=headers,
            )
            self._wait_for_task_completion(res.object.get("href"))

            # Update Vm name
            req_xml = ET.Element(
                "Vm",
                {"name": vm_names[i], "xmlns": "http://www.vmware.com/vcloud/v1.5"},
            )
            res = self.connection.request(
                get_url_path(vm.get("href")),
                data=ET.tostring(req_xml),
                method="PUT",
                headers={"Content-Type": "application/vnd.vmware.vcloud.vm+xml"},
            )
            self._wait_for_task_completion(res.object.get("href"))

    def _change_vm_cpu(self, vapp_or_vm_id, vm_cpu):
        if vm_cpu is None:
            return

        vms = self._get_vm_elements(vapp_or_vm_id)

        for vm in vms:
            # Get virtualHardwareSection/cpu section
            res = self.connection.request(
                "%s/virtualHardwareSection/cpu" % get_url_path(vm.get("href"))
            )

            # Update VirtualQuantity field
            xpath = (
                "{http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/"
                "CIM_ResourceAllocationSettingData}VirtualQuantity"
            )
            res.object.find(xpath).text = str(vm_cpu)

            headers = {"Content-Type": "application/vnd.vmware.vcloud.rasdItem+xml"}
            res = self.connection.request(
                "%s/virtualHardwareSection/cpu" % get_url_path(vm.get("href")),
                data=ET.tostring(res.object),
                method="PUT",
                headers=headers,
            )
            self._wait_for_task_completion(res.object.get("href"))

    def _change_vm_memory(self, vapp_or_vm_id, vm_memory):
        if vm_memory is None:
            return

        vms = self._get_vm_elements(vapp_or_vm_id)

        for vm in vms:
            # Get virtualHardwareSection/memory section
            res = self.connection.request(
                "%s/virtualHardwareSection/memory" % get_url_path(vm.get("href"))
            )

            # Update VirtualQuantity field
            xpath = (
                "{http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/"
                "CIM_ResourceAllocationSettingData}VirtualQuantity"
            )
            res.object.find(xpath).text = str(vm_memory)

            headers = {"Content-Type": "application/vnd.vmware.vcloud.rasdItem+xml"}
            res = self.connection.request(
                "%s/virtualHardwareSection/memory" % get_url_path(vm.get("href")),
                data=ET.tostring(res.object),
                method="PUT",
                headers=headers,
            )
            self._wait_for_task_completion(res.object.get("href"))

    def _add_vm_disk(self, vapp_or_vm_id, vm_disk):
        if vm_disk is None:
            return

        rasd_ns = (
            "{http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/"
            "CIM_ResourceAllocationSettingData}"
        )

        vms = self._get_vm_elements(vapp_or_vm_id)

        for vm in vms:
            # Get virtualHardwareSection/disks section
            res = self.connection.request(
                "%s/virtualHardwareSection/disks" % get_url_path(vm.get("href"))
            )

            existing_ids = []
            new_disk = None

            for item in res.object.findall(fixxpath(res.object, "Item")):
                # Clean Items from unnecessary stuff

                for elem in item:
                    if elem.tag == "%sInstanceID" % rasd_ns:
                        existing_ids.append(int(elem.text))

                    if elem.tag in [
                        "%sAddressOnParent" % rasd_ns,
                        "%sParent" % rasd_ns,
                    ]:
                        item.remove(elem)

                if item.find("%sHostResource" % rasd_ns) is not None:
                    new_disk = item

            new_disk = copy.deepcopy(new_disk)
            disk_id = max(existing_ids) + 1
            new_disk.find("%sInstanceID" % rasd_ns).text = str(disk_id)
            new_disk.find("%sElementName" % rasd_ns).text = "Hard Disk " + str(disk_id)
            new_disk.find("%sHostResource" % rasd_ns).set(
                fixxpath(new_disk, "capacity"), str(int(vm_disk) * 1024)
            )
            res.object.append(new_disk)

            headers = {"Content-Type": "application/vnd.vmware.vcloud.rasditemslist+xml"}
            res = self.connection.request(
                "%s/virtualHardwareSection/disks" % get_url_path(vm.get("href")),
                data=ET.tostring(res.object),
                method="PUT",
                headers=headers,
            )
            self._wait_for_task_completion(res.object.get("href"))

    def _change_vm_script(self, vapp_or_vm_id, vm_script, vm_script_text=None):
        if vm_script is None and vm_script_text is None:
            return

        if vm_script_text is not None:
            script = vm_script_text
        else:
            try:
                with open(vm_script) as fp:
                    script = fp.read()
            except Exception:
                return

        vms = self._get_vm_elements(vapp_or_vm_id)

        # ElementTree escapes script characters automatically. Escape
        # requirements:
        # http://www.vmware.com/support/vcd/doc/rest-api-doc-1.5-html/types/
        # GuestCustomizationSectionType.html

        for vm in vms:
            # Get GuestCustomizationSection
            res = self.connection.request(
                "%s/guestCustomizationSection" % get_url_path(vm.get("href"))
            )

            # Attempt to update any existing CustomizationScript element
            try:
                res.object.find(fixxpath(res.object, "CustomizationScript")).text = script
            except Exception:
                # CustomizationScript section does not exist, insert it just
                # before ComputerName

                for i, e in enumerate(res.object):
                    if e.tag == "{http://www.vmware.com/vcloud/v1.5}ComputerName":
                        break
                e = ET.Element("{http://www.vmware.com/vcloud/v1.5}CustomizationScript")
                e.text = script
                res.object.insert(i, e)

            # Remove AdminPassword from customization section if it would be
            # invalid to include it
            self._remove_admin_password(res.object)

            # Update VM's GuestCustomizationSection
            headers = {
                "Content-Type": "application/vnd.vmware.vcloud.guestCustomizationSection+xml"
            }
            res = self.connection.request(
                "%s/guestCustomizationSection" % get_url_path(vm.get("href")),
                data=ET.tostring(res.object),
                method="PUT",
                headers=headers,
            )
            self._wait_for_task_completion(res.object.get("href"))

    def _change_vm_ipmode(self, vapp_or_vm_id, vm_ipmode):
        if vm_ipmode is None:
            return

        vms = self._get_vm_elements(vapp_or_vm_id)

        for vm in vms:
            res = self.connection.request(
                "%s/networkConnectionSection" % get_url_path(vm.get("href"))
            )
            net_conns = res.object.findall(fixxpath(res.object, "NetworkConnection"))

            for c in net_conns:
                c.find(fixxpath(c, "IpAddressAllocationMode")).text = vm_ipmode

            headers = {"Content-Type": "application/vnd.vmware.vcloud.networkConnectionSection+xml"}

            res = self.connection.request(
                "%s/networkConnectionSection" % get_url_path(vm.get("href")),
                data=ET.tostring(res.object),
                method="PUT",
                headers=headers,
            )
            self._wait_for_task_completion(res.object.get("href"))

    @staticmethod
    def _remove_admin_password(guest_customization_section):
        """
        Remove AdminPassword element from GuestCustomizationSection if it
        would be invalid to include it.

        This was originally done unconditionally due to an "API quirk" of
        unknown origin or effect. When AdminPasswordEnabled is set to true
        and AdminPasswordAuto is false, the admin password must be set or
        an error will ensue, and vice versa.
        :param guest_customization_section: GuestCustomizationSection element
                                            to remove password from (if valid
                                            to do so)
        :type guest_customization_section: ``ET.Element``
        """
        admin_pass_enabled = guest_customization_section.find(
            fixxpath(guest_customization_section, "AdminPasswordEnabled")
        )
        admin_pass_auto = guest_customization_section.find(
            fixxpath(guest_customization_section, "AdminPasswordAuto")
        )
        admin_pass = guest_customization_section.find(
            fixxpath(guest_customization_section, "AdminPassword")
        )

        if admin_pass is not None and (
            admin_pass_enabled is None
            or admin_pass_enabled.text != "true"
            or admin_pass_auto is None
            or admin_pass_auto.text != "false"
        ):
            guest_customization_section.remove(admin_pass)

    def _update_or_insert_section(self, res, section, prev_section, text):
        try:
            res.object.find(fixxpath(res.object, section)).text = text
        except Exception:
            # "section" section does not exist, insert it just
            # before "prev_section"

            for i, e in enumerate(res.object):
                tag = "{http://www.vmware.com/vcloud/v1.5}%s" % prev_section

                if e.tag == tag:
                    break
            e = ET.Element("{http://www.vmware.com/vcloud/v1.5}%s" % section)
            e.text = text
            res.object.insert(i, e)

        return res

    def ex_change_vm_admin_password(self, vapp_or_vm_id, ex_admin_password):
        """
        Changes the admin (or root) password of VM or VMs under the vApp. If
        the vapp_or_vm_id param represents a link to an vApp all VMs that
        are attached to this vApp will be modified.

        :keyword    vapp_or_vm_id: vApp or VM ID that will be modified. If a
                                   vApp ID is used here all attached VMs
                                   will be modified
        :type       vapp_or_vm_id: ``str``

        :keyword    ex_admin_password: admin password to be used.
        :type       ex_admin_password: ``str``

        :rtype: ``None``
        """

        if ex_admin_password is None:
            return

        vms = self._get_vm_elements(vapp_or_vm_id)

        for vm in vms:
            # Get GuestCustomizationSection
            res = self.connection.request(
                "%s/guestCustomizationSection" % get_url_path(vm.get("href"))
            )

            headers = {
                "Content-Type": "application/vnd.vmware.vcloud.guestCustomizationSection+xml"
            }

            # Fix API quirk.
            # If AdminAutoLogonEnabled==False the guestCustomizationSection
            # must have AdminAutoLogonCount==0, even though
            # it might have AdminAutoLogonCount==1 when requesting it for
            # the first time.
            auto_logon = res.object.find(fixxpath(res.object, "AdminAutoLogonEnabled"))

            if auto_logon is not None and auto_logon.text == "false":
                self._update_or_insert_section(
                    res, "AdminAutoLogonCount", "ResetPasswordRequired", "0"
                )

            # If we are establishing a password we do not want it
            # to be automatically chosen.
            self._update_or_insert_section(res, "AdminPasswordAuto", "AdminPassword", "false")

            # API does not allow to set AdminPassword if
            # AdminPasswordEnabled is not enabled.
            self._update_or_insert_section(res, "AdminPasswordEnabled", "AdminPasswordAuto", "true")

            self._update_or_insert_section(
                res, "AdminPassword", "AdminAutoLogonEnabled", ex_admin_password
            )

            res = self.connection.request(
                "%s/guestCustomizationSection" % get_url_path(vm.get("href")),
                data=ET.tostring(res.object),
                method="PUT",
                headers=headers,
            )
            self._wait_for_task_completion(res.object.get("href"))

    def _get_network_href(self, network_name):
        network_href = None

        # Find the organisation's network href
        res = self.connection.request(self.org)
        links = res.object.findall(fixxpath(res.object, "Link"))

        for link in links:
            if (
                link.attrib["type"] == "application/vnd.vmware.vcloud.orgNetwork+xml"
                and link.attrib["name"] == network_name
            ):
                network_href = link.attrib["href"]

        if network_href is None:
            raise ValueError("%s is not a valid organisation network name" % network_name)
        else:
            return network_href

    def _ex_get_node(self, node_id):
        """
        Get a node instance from a node ID.

        :param node_id: ID of the node
        :type node_id: ``str``

        :return: node instance or None if not found
        :rtype: :class:`Node` or ``None``
        """
        res = self.connection.request(
            get_url_path(node_id),
            headers={"Content-Type": "application/vnd.vmware.vcloud.vApp+xml"},
        )

        return self._to_node(res.object)

    def _get_vm_elements(self, vapp_or_vm_id):
        res = self.connection.request(get_url_path(vapp_or_vm_id))

        if res.object.tag.endswith("VApp"):
            vms = res.object.findall(fixxpath(res.object, "Children/Vm"))
        elif res.object.tag.endswith("Vm"):
            vms = [res.object]
        else:
            raise ValueError("Specified ID value is not a valid VApp or Vm identifier.")

        return vms

    def _is_node(self, node_or_image):
        return isinstance(node_or_image, Node)

    def _to_node(self, node_elm):
        # Parse snapshots and VMs as extra

        if node_elm.find(fixxpath(node_elm, "SnapshotSection")) is None:
            snapshots = None
        else:
            snapshots = []

            for snapshot_elem in node_elm.findall(fixxpath(node_elm, "SnapshotSection/Snapshot")):
                snapshots.append(
                    {
                        "created": snapshot_elem.get("created"),
                        "poweredOn": snapshot_elem.get("poweredOn"),
                        "size": snapshot_elem.get("size"),
                    }
                )

        vms = []

        for vm_elem in node_elm.findall(fixxpath(node_elm, "Children/Vm")):
            public_ips = []
            private_ips = []

            xpath = fixxpath(vm_elem, "NetworkConnectionSection/NetworkConnection")

            for connection in vm_elem.findall(xpath):
                ip = connection.find(fixxpath(connection, "IpAddress"))

                if ip is not None:
                    private_ips.append(ip.text)
                external_ip = connection.find(fixxpath(connection, "ExternalIpAddress"))

                if external_ip is not None:
                    public_ips.append(external_ip.text)
                elif ip is not None:
                    public_ips.append(ip.text)

            xpath = "{http://schemas.dmtf.org/ovf/envelope/1}" "OperatingSystemSection"
            os_type_elem = vm_elem.find(xpath)

            if os_type_elem is not None:
                os_type = os_type_elem.get("{http://www.vmware.com/schema/ovf}osType")
            else:
                os_type = None
            vm = {
                "id": vm_elem.get("href"),
                "name": vm_elem.get("name"),
                "state": self.NODE_STATE_MAP[vm_elem.get("status")],
                "public_ips": public_ips,
                "private_ips": private_ips,
                "os_type": os_type,
            }
            vms.append(vm)

        # Take the node IP addresses from all VMs
        public_ips = []
        private_ips = []

        for vm in vms:
            public_ips.extend(vm["public_ips"])
            private_ips.extend(vm["private_ips"])

        # Find vDC
        vdc_id = next(
            link.get("href")
            for link in node_elm.findall(fixxpath(node_elm, "Link"))
            if link.get("type") == "application/vnd.vmware.vcloud.vdc+xml"
        )  # pylint: disable=no-member
        vdc = next(vdc for vdc in self.vdcs if vdc.id == vdc_id)

        extra = {"vdc": vdc.name, "vms": vms}

        description = node_elm.find(fixxpath(node_elm, "Description"))

        if description is not None:
            extra["description"] = description.text
        else:
            extra["description"] = ""

        lease_settings = node_elm.find(fixxpath(node_elm, "LeaseSettingsSection"))

        if lease_settings is not None:
            extra["lease_settings"] = Lease.to_lease(lease_settings)
        else:
            extra["lease_settings"] = None

        if snapshots is not None:
            extra["snapshots"] = snapshots

        node = Node(
            id=node_elm.get("href"),
            name=node_elm.get("name"),
            state=self.NODE_STATE_MAP[node_elm.get("status")],
            public_ips=public_ips,
            private_ips=private_ips,
            driver=self.connection.driver,
            extra=extra,
        )

        return node

    def _to_vdc(self, vdc_elm):
        def get_capacity_values(capacity_elm):
            if capacity_elm is None:
                return None
            limit = int(capacity_elm.findtext(fixxpath(capacity_elm, "Limit")))
            used = int(capacity_elm.findtext(fixxpath(capacity_elm, "Used")))
            units = capacity_elm.findtext(fixxpath(capacity_elm, "Units"))

            return Capacity(limit, used, units)

        cpu = get_capacity_values(vdc_elm.find(fixxpath(vdc_elm, "ComputeCapacity/Cpu")))
        memory = get_capacity_values(vdc_elm.find(fixxpath(vdc_elm, "ComputeCapacity/Memory")))
        storage = get_capacity_values(vdc_elm.find(fixxpath(vdc_elm, "StorageCapacity")))

        return Vdc(
            id=vdc_elm.get("href"),
            name=vdc_elm.get("name"),
            driver=self,
            allocation_model=vdc_elm.findtext(fixxpath(vdc_elm, "AllocationModel")),
            cpu=cpu,
            memory=memory,
            storage=storage,
        )


class VCloud_5_1_NodeDriver(VCloud_1_5_NodeDriver):
    @staticmethod
    def _validate_vm_memory(vm_memory):
        if vm_memory is None:
            return None
        elif (vm_memory % 4) != 0:
            # The vcd 5.1 virtual machine memory size must be a multiple of 4
            # MB
            raise ValueError("%s is not a valid vApp VM memory value" % (vm_memory))


class VCloud_5_5_NodeDriver(VCloud_5_1_NodeDriver):
    """Use 5.5 Connection class to explicitly set 5.5 for the version in
    Accept headers
    """

    connectionCls = VCloud_5_5_Connection

    def ex_create_snapshot(self, node):
        """
        Creates new snapshot of a virtual machine or of all
        the virtual machines in a vApp. Prior to creation of the new
        snapshots, any existing user created snapshots associated
        with the virtual machines are removed.

        :param  node: node
        :type   node: :class:`Node`

        :rtype: :class:`Node`
        """
        snapshot_xml = ET.Element(
            "CreateSnapshotParams",
            {
                "memory": "true",
                "name": "name",
                "quiesce": "true",
                "xmlns": "http://www.vmware.com/vcloud/v1.5",
                "xmlns:xsi": "http://www.w3.org/2001/XMLSchema-instance",
            },
        )
        ET.SubElement(snapshot_xml, "Description").text = "Description"
        content_type = "application/vnd.vmware.vcloud.createSnapshotParams+xml"
        headers = {"Content-Type": content_type}

        return self._perform_snapshot_operation(node, "createSnapshot", snapshot_xml, headers)

    def ex_remove_snapshots(self, node):
        """
        Removes all user created snapshots for a vApp or virtual machine.

        :param  node: node
        :type   node: :class:`Node`

        :rtype: :class:`Node`
        """

        return self._perform_snapshot_operation(node, "removeAllSnapshots", None, None)

    def ex_revert_to_snapshot(self, node):
        """
        Reverts a vApp or virtual machine to the current snapshot, if any.

        :param  node: node
        :type   node: :class:`Node`

        :rtype: :class:`Node`
        """

        return self._perform_snapshot_operation(node, "revertToCurrentSnapshot", None, None)

    def _perform_snapshot_operation(self, node, operation, xml_data, headers):
        res = self.connection.request(
            "{}/action/{}".format(get_url_path(node.id), operation),
            data=ET.tostring(xml_data) if xml_data is not None else None,
            method="POST",
            headers=headers,
        )
        self._wait_for_task_completion(res.object.get("href"))
        res = self.connection.request(get_url_path(node.id))

        return self._to_node(res.object)

    def ex_acquire_mks_ticket(self, vapp_or_vm_id, vm_num=0):
        """
        Retrieve a mks ticket that you can use to gain access to the console
        of a running VM. If successful, returns a dict with the following
        keys:

          - host: host (or proxy) through which the console connection
                is made
          - vmx: a reference to the VMX file of the VM for which this
               ticket was issued
          - ticket: screen ticket to use to authenticate the client
          - port: host port to be used for console access

        :param  vapp_or_vm_id: vApp or VM ID you want to connect to.
        :type   vapp_or_vm_id: ``str``

        :param  vm_num: If a vApp ID is provided, vm_num is position in the
                vApp VM list of the VM you want to get a screen ticket.
                Default is 0.
        :type   vm_num: ``int``

        :rtype: ``dict``
        """
        vm = self._get_vm_elements(vapp_or_vm_id)[vm_num]
        try:
            res = self.connection.request(
                "%s/screen/action/acquireMksTicket" % (get_url_path(vm.get("href"))),
                method="POST",
            )
            output = {
                "host": res.object.find(fixxpath(res.object, "Host")).text,
                "vmx": res.object.find(fixxpath(res.object, "Vmx")).text,
                "ticket": res.object.find(fixxpath(res.object, "Ticket")).text,
                "port": res.object.find(fixxpath(res.object, "Port")).text,
            }

            return output
        except Exception:
            return None
